$x^2\frac{dy}{dx}=-\frac{1}{y^2}$
$\int_0^4\left(\frac{x^3}{\left(x^2+7\right)^2}\right)dx$
$\frac{a^{5-1}}{a-1}$
$\frac{4n^2-7n^2+n^2}{2n+1}$
$\sqrt{3}\tan\left(x\right)-5=-4$
$\int\frac{x^3+1}{\left(x-1\right)}dx$
$60x+1100>4000$
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